a piece of cake
• something easily achieved.
• "I never said that training him would be a piece of cake"
Similar:
easy task,
easy job,
child's play,
nothing,
five-finger exercise,
gift,
walkover,
sinecure,
breeze,
doddle,
walk in the park,
picnic,
money for old rope,
money for jam,
cinch,
sitter,
kids' stuff,
cushy job/number,
doss,
cakewalk,
pushover,
duck soup,
snap,
bludge,
snack,
a piece of old tackie,
snip,
a piece of piss,